Folium
The word ``folium'' means leaf-shaped. The polar equation is
If
, it is a single folium. If 
, it is a Bifolium. If 
, it is a Trifolium. Thesimple folium is the Pedal Curve of the Deltoid where the Pedal Point is one of the Cusps.See also Bifolium, Folium of Descartes, Kepler's Folium, Quadrifolium, Rose, Trifolium
References
Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 152-153, 1972. MacTutor History of Mathematics Archive. ``Folium.''http://www-groups.dcs.st-and.ac.uk/~history/Curves/Folium.html.
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